Torsion of the left ventricle during pacing with MRI tagging

Jonathan M. Sorger; Bradley T. Wyman; Owen P. Faris; William R. Hunter; Elliot R. McVeigh

doi:10.1117/12.383401

20 April 2000 Torsion of the left ventricle during pacing with MRI tagging

Jonathan M. Sorger, Bradley T. Wyman, Owen P. Faris, William R. Hunter, Elliot R. McVeigh

Proceedings Volume 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images; (2000) https://doi.org/10.1117/12.383401
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

In this study the effects of different pacing protocols on left ventricular (LV) torsion was evaluated over the full cardiac cycle. A systolic and diastolic series of Magnetic Resonance Imaging scans were combined and used to calculate the torsion of the LV. The asynchronous contraction resulting from ventricular pacing interferes with the temporal evolution of LV torsion. From these experiments we have shown that measuring torsion is an extremely sensitive indicator of the existence of ectopic excitation. The torsion of the left ventricle was investigated under three different protocols: (1) Right atrial pacing, (2) Right ventricular pacing and (3) Simultaneous pacing from the right ventricular apex and left ventricular base. The temporal evolution of torsion was determined from tagged magnetic resonance images and was evaluated over the full cardiac cycle. The peak twist T_max for the RA paced heart was 11.09 (+/- 3.54) degrees compared to 6.06 (+/- 1.65) degrees and 6.09 (+/- 0.68) degrees for the RV and Bi-V paced hearts respectively. While biventricular pacing has been shown to increase the synchrony of contraction, it does not preserve the normal physiological twist patterns of the heart.

Citation Download Citation

Jonathan M. Sorger, Bradley T. Wyman, Owen P. Faris, William R. Hunter, and Elliot R. McVeigh "Torsion of the left ventricle during pacing with MRI tagging", Proc. SPIE 3978, Medical Imaging 2000: Physiology and Function from Multidimensional Images, (20 April 2000); https://doi.org/10.1117/12.383401

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